I think Brass is a terrific material and will be used more and more in the future.
The way we are all thinking about our car set ups and using ballast to tune to individual preferences and characteristics means that a dense material makes most sense.
Since lead is not a nice material to play with and gold is a little bit too expensive, Brass gets my vote all the time.
Stainless Steel would be cool also but I can't see weight plates and weight tuning going away any time soon.
Like Tony says - the lipo itself is too light to effectively be used to change the weight distribution but it does open up a whole host of ideas on where you could use some effective ballast material if need be.
Also, in the US, many stock class racers still like to run as close as possible to the ROAR minimum weight limit. The little LiPo helps hem to achieve this without having to sacrifice any of the car's inherent strength or weight.
Anyhow, as others have already observed - hopefully, this new LiPo will help open up tuning opportunities that had previously been thought of as not possible with the traditional sized cells.
Or maybe even a 2S 1/12 link car or even a mardave caterham - that would be fun to see
